This part is a kind of semiconductor called SS495.

Function of this product has Linear Hall Effect Sensor.

Manufacturers : SEC

Image and pinout :

Some of the text within the PDF file :

SS495 Linear Hall Effect Sensor Features Miniature construction Low-Noise Output Good Consistency High sensitivity High reliability 4.5 V to 10.5 V Operation Voltages Magnetically Optimized Package Linear output for circuit design flexibility Temperature range from -40 °C to 150 °C 3 pin SIP (suffix UA) Description SS495 Linear Hall-effect sensor is a small, versatile linear Hall-effect device that is operated by the magnetic field from a permanent magnet or an electromagnet. The linear sourcing output voltage is set by the supply voltage and varies in proportion to the strength of the magnetic field. Specifically, when S495 is in the zero magnetic field conditions, the output voltage is half of the supply voltage. When south poles approach the S495 marking surface, the output voltage w [ ... ]

SS495 PDF Datasheet Download